package com.spzx.order.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.spzx.cart.api.RemoteCartService;
import com.spzx.cart.api.domain.CartInfo;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.core.utils.uuid.UUID;
import com.spzx.common.rabbit.constant.MqConst;
import com.spzx.common.rabbit.service.RabbitService;
import com.spzx.common.security.utils.SecurityUtils;
import com.spzx.order.domain.OrderInfo;
import com.spzx.order.domain.OrderItem;
import com.spzx.order.domain.OrderLog;
import com.spzx.order.form.OrderForm;
import com.spzx.order.mapper.OrderInfoMapper;
import com.spzx.order.mapper.OrderItemMapper;
import com.spzx.order.mapper.OrderLogMapper;
import com.spzx.order.service.IOrderInfoService;
import com.spzx.order.vo.TradeVo;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.api.RemoteSkuStockService;
import com.spzx.product.api.domain.ProductSkuVo;
import com.spzx.product.api.domain.SkuLockVo;
import com.spzx.product.api.domain.SkuPriceVo;
import com.spzx.user.api.RemoteUserAddressService;
import com.spzx.user.api.domain.UserAddress;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * <p>
 * 订单 服务实现类
 * </p>
 *
 * @author atguigu
 * @since 2024-12-30
 */
@Service
public class OrderInfoServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfo> implements IOrderInfoService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RemoteCartService remoteCartService;

    @Autowired
    private RemoteProductService remoteProductService;

    @Autowired
    private RemoteUserAddressService remoteUserAddressService;

    @Autowired
    private OrderLogMapper orderLogMapper;

    @Autowired
    private OrderItemMapper orderItemMapper;

    @Autowired
    private RemoteSkuStockService remoteSkuStockService;

    @Autowired
    private RabbitService rabbitService;


    @Override
    public TradeVo orderTradeData() {
        Long userId = SecurityUtils.getUserId();
        R<List<CartInfo>> resultCarCheckedList = remoteCartService.getCartCheckedList(SecurityConstants.INNER);
        if (R.FAIL == resultCarCheckedList.getCode()) {
            throw new ServiceException(resultCarCheckedList.getMsg());
        }

        List<CartInfo> cartCheckedList = resultCarCheckedList.getData();

        List<OrderItem> orderItemList = null;
        if (!CollectionUtils.isEmpty(cartCheckedList)){
            orderItemList = cartCheckedList.stream().map(cartInfo -> {
                OrderItem orderItem = new OrderItem();
                BeanUtils.copyProperties(cartInfo, orderItem);
                return orderItem;
            }).collect(Collectors.toList());
        }

        BigDecimal total = null;
        total = orderItemList.stream()
                .map(orderItem -> orderItem.getSkuPrice().multiply(new BigDecimal(orderItem.getSkuNum())))//处理数据
                .reduce(BigDecimal.ZERO, BigDecimal::add);//汇总

        TradeVo tradeVo = new TradeVo();
        tradeVo.setTradeNo(generateTradeNo(userId));
        tradeVo.setTotalAmount(total);
        tradeVo.setOrderItemList(orderItemList);

        return tradeVo;

    }

    @Override
    public Long submitOrder(OrderForm orderForm) {

        //获取用户id
        Long userId = SecurityUtils.getUserId();

     /*   //版本1：页面重复提交和订单号超时，都是订单号在redis中不存在
        //1 防止订单重复提交&防止页面停留超时
        //TODO
        if(!this.checkTradeNo(userId.toString(),orderForm.getTradeNo())){
            throw new ServiceException("请勿重复提交订单");
        }
        //删除redis中的订单号
        this.deleteTradeNo(userId.toString());*/

        //版本2：
        //（1）返回1：第一次提交后，将 "user:tradeNo:" + userId 的值改成其他的内容，例如 processed（已处理）
        //（2）返回-1：第二次提交（重复提交），判断redis中的值是否为processed（已处理）/或者判断当前key是存在的，且值不等于订单号（已处理），判断之后将key删除
        //（3）返回0：提交时，发现，如果订单号不存在，则可以判断为页面停留时间过长
        String userTradeKey = "user:tradeNo:" + userId;
        // 将键的值更为 processed  表示已处理
        // return 1 表示处理成功
        // return -1  键存在但值不匹配，表示重复提交
        // return 0   键不存在，订单过期
        String scriptText = """
                if redis.call('get', KEYS[1]) == ARGV[1] then
                       redis.call('set', KEYS[1], 'processed', 'ex', ARGV[2])
                       return 1
                   else
                    if redis.call('exists', KEYS[1]) == 1 then
                           return -1
                       else
                   	    return 0
                       end
                   end
                """;
        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
        redisScript.setScriptText(scriptText);
        redisScript.setResultType(Long.class);

        Long flag = (Long) redisTemplate.execute(redisScript, Arrays.asList(userTradeKey), orderForm.getTradeNo(), 300);
        if (flag == 0) {
            throw new ServiceException("页面停留时间过长，请重新提交订单！");
        }
        if (flag == -1) {
            throw new ServiceException("请勿重复提交订单！");
        }

        //2 判断商品价格是否变更，如果变更则更新购物车中的价格信息
        //if(!orderForm.getIsBuy()){
            //2.1 批量获取实时商品价格
            List<OrderItem> orderItemList = orderForm.getOrderItemList();
            List<Long> skuIdList = orderItemList.stream().map(OrderItem::getSkuId).collect(Collectors.toList());
            R<List<SkuPriceVo>> skuPriceListResult = remoteProductService.getSkuPriceList(skuIdList, SecurityConstants.INNER);
            if(R.FAIL == skuPriceListResult.getCode()){
                throw new ServiceException(skuPriceListResult.getMsg());
            }
            List<SkuPriceVo> skuPriceVoList = skuPriceListResult.getData();
            //2.2 并判断价格是否变更
            //O(n的2次方)
        /*for (OrderItem orderItem : orderItemList) {
            for (SkuPriceVo skuPriceVo : skuPriceVoList) {
                if(orderItem.getSkuPrice().compareTo(skuPriceVo.getSalePrice()) != 0){
                    //价格发生了变化
                }
            }
        }*/
            //O(n)
            String priceCheckResult = "";
            Map<Long, BigDecimal> skuPriceMap = skuPriceVoList.stream().collect(Collectors.toMap(SkuPriceVo::getSkuId, SkuPriceVo::getSalePrice));
            for (OrderItem orderItem : orderItemList) {
                if(orderItem.getSkuPrice().compareTo(skuPriceMap.get(orderItem.getSkuId())) != 0){
                    //价格发生了变化
                    priceCheckResult += orderItem.getSkuName() + "\n";
                }
            }
            //2.3 如果有变更，则更新购物车中的商品价格
            if(StringUtils.hasText(priceCheckResult)) {
                if (!orderForm.getIsBuy()) {
                    R<Boolean> updateCartPriceResult = remoteCartService.updateCartPrice(userId, SecurityConstants.INNER);
                if (R.FAIL == updateCartPriceResult.getCode()) {
                    throw new ServiceException(updateCartPriceResult.getMsg());
                }
            }
                //如果价格有变更则中止下单
                throw new ServiceException("价格发生变化，请重新下单！\n" + priceCheckResult);
            }
        //}

        //3 校验库存并锁定库存
        List<SkuLockVo> skuLockVoList = orderItemList.stream().map(orderItem -> {
            SkuLockVo skuLockVo = new SkuLockVo();
            skuLockVo.setSkuId(orderItem.getSkuId());
            skuLockVo.setSkuNum(orderItem.getSkuNum());
            skuLockVo.setSkuName(orderItem.getSkuName());
            //BeanUtils.copyProperties(orderItem, skuLockVo);
            return skuLockVo;
        }).collect(Collectors.toList());


        R<String> result = remoteSkuStockService.checkAndLock(
                orderForm.getTradeNo(),
                skuLockVoList,
                SecurityConstants.INNER
        );
        if(R.FAIL == result.getCode()){
            throw new ServiceException(result.getMsg());
        }
        String errMsg = result.getData();
        if(StringUtils.hasText(errMsg)){
            throw new ServiceException(errMsg);
        }

        Long orderId = null;
        try {
            //4 下单
            //`order_info`
            //`order_item`
            //`order_log`
            orderId = saveOrder(orderForm);
        } catch (Exception e) {
            //解锁库存：通过MQ发送消息，将库存解锁
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderForm.getTradeNo());

            e.printStackTrace();
            throw new ServiceException("保存订单信息失败");
        }

        //4 删除购物车中的选中商品
        if(!orderForm.getIsBuy()){
            R<Boolean> deleteResult = remoteCartService.deleteCartCheckedList(userId, SecurityConstants.INNER);
            if(R.FAIL == deleteResult.getCode()){
                throw new ServiceException(deleteResult.getMsg());
            }
        }


        //5 校验库存并锁定库存
        //TODO

        return orderId;
    }

    @Override
    public TradeVo buy(Long skuId) {
        R<ProductSkuVo> productSkuVoResult = remoteProductService.getProductSkuVo(skuId, SecurityConstants.INNER);
        if (R.FAIL == productSkuVoResult.getCode()) {
            throw new ServiceException(productSkuVoResult.getMsg());
        }

        ProductSkuVo productSkuVo = productSkuVoResult.getData();
        ArrayList<OrderItem> orderItemList = new ArrayList<>();

        OrderItem orderItem = new OrderItem();
        orderItem.setSkuId(skuId);
        orderItem.setSkuName(productSkuVo.getSkuName());
        orderItem.setThumbImg(productSkuVo.getThumbImg());
        orderItem.setSkuPrice(productSkuVo.getSalePrice());
        orderItem.setSkuNum(1);
        orderItemList.add(orderItem);

        TradeVo tradeVo = new TradeVo();
        tradeVo.setTotalAmount(productSkuVo.getSalePrice());
        tradeVo.setIsBuy(true);
        tradeVo.setOrderItemList(orderItemList);
        tradeVo.setTradeNo(generateTradeNo(SecurityUtils.getUserId()));


        return tradeVo;
    }

    @Override
    public List<OrderInfo> selectUserOrderInfoList(Integer orderStatus) {

        Long userId = SecurityUtils.getUserId();
        LambdaQueryWrapper<OrderInfo> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(OrderInfo::getUserId, userId);
        queryWrapper.eq(orderStatus != null, OrderInfo::getOrderStatus, orderStatus);
        queryWrapper.orderByDesc(OrderInfo::getCreateTime);

        List<OrderInfo> orderInfoList = baseMapper.selectList(queryWrapper);
        //O(n)
        /*for (OrderInfo orderInfo : orderInfoList) {
            Long id = orderInfo.getId();
            //根据orderInfo的id查询orderItemList:sql
        }*/

        //获取所有的orderId列表
        if(!CollectionUtils.isEmpty(orderInfoList)) {
            List<Long> orderIdList = orderInfoList.stream().map(OrderInfo::getId).collect(Collectors.toList());

            List<OrderItem> orderItemList = orderItemMapper.selectList(
                    new LambdaQueryWrapper<OrderItem>().in(OrderItem::getOrderId, orderIdList)
            );

            //用orderId将orderItemList进行分组，组装成Map，orderId做key，List<OrderItem>做value
            Map<Long, List<OrderItem>> orderItemMap = orderItemList
                    .stream()
                    .collect(Collectors.groupingBy(OrderItem::getOrderId));

            //将OrderItem装配到对应的OrderInfo的orderItemList属性中
            orderInfoList.forEach(orderInfo -> {
                Long id = orderInfo.getId();
                orderInfo.setOrderItemList(orderItemMap.get(id));
            });
        }


        return orderInfoList;
    }

    @Override
    public OrderInfo selectOrderInfoById(Long orderId) {
        OrderInfo orderInfo = baseMapper.selectById(orderId);
        orderInfo.setOrderItemList(orderItemMapper.selectList(
                new LambdaQueryWrapper<OrderItem>().eq(OrderItem::getOrderId, orderId))
        );
        return orderInfo;
    }

    @Override
    public void cancelOrder(Long orderId) {
        OrderInfo orderInfo = baseMapper.selectById(orderId);
        if(orderInfo != null && orderInfo.getOrderStatus().intValue() == 0) {
            orderInfo.setOrderStatus(-1);//已取消
            orderInfo.setCancelTime(new Date());
            orderInfo.setCancelReason("用户取消订单");
            baseMapper.updateById(orderInfo);

            //记录日志
            OrderLog orderLog = new OrderLog();
            orderLog.setOrderId(orderInfo.getId());
            orderLog.setProcessStatus(-1);
            orderLog.setNote("用户取消订单");
            orderLogMapper.insert(orderLog);
        }
    }

    private Long saveOrder(OrderForm orderForm) {
        Long userId = SecurityContextHolder.getUserId();
        String userName = SecurityContextHolder.getUserName();

        // 保存订单记录：order_info
        OrderInfo orderInfo = new OrderInfo();
        orderInfo.setUserId(userId);
        orderInfo.setOrderNo(orderForm.getTradeNo());//订单号
        orderInfo.setNickName(userName);
        orderInfo.setRemark(orderForm.getRemark());
        orderInfo.setFeightFee(orderForm.getFeightFee());

        //远程调用获取用户地址信息
        R<UserAddress> userAddressResult = remoteUserAddressService.getUserAddress(orderForm.getUserAddressId(), SecurityConstants.INNER);
        if(R.FAIL == userAddressResult.getCode()){
            throw new ServiceException(userAddressResult.getMsg());
        }
        //获取用户地址信息
        UserAddress userAddress = userAddressResult.getData();
        //保存用户地址信息
        orderInfo.setReceiverName(userAddress.getName());
        orderInfo.setReceiverPhone(userAddress.getPhone());
        orderInfo.setReceiverTagName(userAddress.getTagName());
        orderInfo.setReceiverProvince(userAddress.getProvinceCode());
        orderInfo.setReceiverCity(userAddress.getCityCode());
        orderInfo.setReceiverDistrict(userAddress.getDistrictCode());
        orderInfo.setReceiverAddress(userAddress.getFullAddress());

        //实时获取总价格
        //计算orderItem中商品的总价格
        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        BigDecimal totalAmount = orderItemList
                .stream()
                .map(orderItem -> orderItem.getSkuPrice().multiply(new BigDecimal(orderItem.getSkuNum())))
                .reduce(BigDecimal.ZERO, BigDecimal::add);
        //设置商品总价格
        orderInfo.setTotalAmount(totalAmount);
        orderInfo.setCouponAmount(new BigDecimal(0));//优惠券价格
        orderInfo.setOriginalTotalAmount(totalAmount);//原价
        //订单状态
        orderInfo.setOrderStatus(0);//待付款

        orderInfo.setCreateBy(userName);
        orderInfo.setUpdateBy(userName);
        baseMapper.insert(orderInfo);

        // 保存订单项记录：order_item
        for (OrderItem orderItem : orderItemList) {
            orderItem.setOrderId(orderInfo.getId());
            orderItem.setCreateBy(userName);
            orderItem.setUpdateBy(userName);
            orderItemMapper.insert(orderItem);
        }

        // 保存订单日志记录：order_log
        OrderLog orderLog = new OrderLog();
        orderLog.setOrderId(orderInfo.getId());
        orderLog.setProcessStatus(0);
        orderLog.setOperateUser(userName);
        orderLog.setNote("提交订单");
        orderLog.setCreateBy(userName);
        orderLog.setUpdateBy(userName);
        orderLogMapper.insert(orderLog);

        return orderInfo.getId();
    }


    /**
     * 验证页面提交流水号是否有效
     *
     * @param userId
     * @param tradeNo
     * @return
     */
    private Boolean checkTradeNo(String userId, String tradeNo) {
        String userTradeKey = "user:tradeNo:" + userId;
        String redisTradeNo = (String) redisTemplate.opsForValue().get(userTradeKey);
        return tradeNo.equals(redisTradeNo);
    }

    /**
     * 删除流水号
     *
     * @param userId
     */
    private void deleteTradeNo(String userId) {
        String userTradeKey = "user:tradeNo:" + userId;
        redisTemplate.delete(userTradeKey);
    }



    /**
     * 渲染订单确认页面-生成用户流水号
     *
     * @param userId
     * @return
     */
    private String generateTradeNo(Long userId) {
        //1.构建流水号Key
        String userTradeKey = "user:tradeNo:" + userId;
        //2.构建流水号value
        String tradeNo = UUID.randomUUID().toString().replaceAll("-", "");
        //3.将流水号存入Redis 暂存5分钟
        redisTemplate.opsForValue().set(userTradeKey, tradeNo, 5, TimeUnit.MINUTES);
        return tradeNo;
}
}
